#include <iostream>

double light_year2astronomical_units(double light_year);

int main() {
    using namespace std;
    double light_year = 0;
    cout << "Enter the number of light years: ";
    cin >> light_year;
    cout << light_year << " light years = " << light_year2astronomical_units(light_year) << " astronomical units.";
    return 0;
}


double light_year2astronomical_units(double light_year)
{
    return light_year * 63240;
}
